Burns



2 Sheets- Sheet L I R. F. BURNS. Edge-Trimming Machines for Boot andShoe Soles. N0.l58,569. Patent edJan.1'2,1875.

Tllg 3 A I 1- I J qwitues 5' f Y I I Maren/770v:

, R. F BuRNS. Edge-Tlim ming Machines for Boot a No. 158,569.

mi Shoe. Sales. 1 Patented Jan. 12, 1875.

Allin-neg.

UNITED STATES.

PATENT Grrrcn. A

nonnnr F. I 3URNS, or New YORK, N. Y,, ASSIGNOR TO THE Bonus MACHINECOMPANY, or SAME rnncn. a

IIVLPROVEMENIJN EDGEX-IRIMVMI"NG MACH|NES FOR BOOT AND sHoE sores.

Specification forming part of Letters Patent No. 158,569, dated January12,1.37%,applicationfiled October 23, 1874.

To all whom it may concern Be it known that I, ROBERT F. BURNs, of thepity of New ork and State ofNew York,

= haveinvented an Edge-Trimming Machine for boots and shoes, and, inthis instance, is applied as. an edge-trimmer, the object being tothoroughly and smoothly trim the edges of the soles at one'operationandat a rapid rate. In carrying out my plans I have found it convenientto use ,portions of the mechanism for adjusting the position of the bootor shoe while being. trimmed, similar to that as shown in the LettersPatent No. 97,758,.of1869, granted to me for a machine for polishing theedges of'boot and shoe soles, and the construction of toy-presentmachine' for trimming resembles thesame in generaldesign, though adaptedtoanother'purpose.

In my presentinvention I employ a revolving circular cutter-head,-having on and forming a part of its circumference a series of spiralcutting-blades placed parallel'to its axis. On the innerfaceofthis'cutter-head, and also forming a part of it, are small verticalcuttingblades placed at a given angle above, and inclined to the rear ofthe parallelspiral-blades. The edge of the-'cutter-head projects abovethe cutting-bladesgand at its outer circumference is perfectly smoothfor the purpose of protect ing the F uppers of the boots or shoes frombeing'injured' This cutter-head and its two sets of blades is made ofone piece of metal. It is constructed hollow for the purpose ofpreventing any clogging by the chips and shavingseat from the sole, theypassing freely between the spiral knives intothe interior of thecutter-head, and dropping out of the same I through the ppening in' itsface." The function of the spiralknives is to out and trim the face ofthe edge of the sole; that of ,the vertical knives (which I termfeathering-knives) is to finish the'corners of the sole, removing anyroughness or feather left by the spiral knives. I also employ a doubleadjustable gage so arranged that the sole may be trimmed above orbelow'the cutter-head as best suits the convenience of the operator;also, fixed rests, having thereon adjustable guides ,-(also madedoub]e,) adjusted by a right-an'd-lefthand set-screw, to adapt themtof'gumrning the position of the sole for any desired thick i ness of'cutby the spiral knives.

In the drawings, Figure l is a plan view Fig. 2, a side elevation; Fig.3, a front elevation; Fig.4, an enlarged side elevation of the circularcutter-head; Fig. 5, a vertical section of the same; Fig. 6, a sectionalfront eleva- 'tion, showing the form of the two sets of cutting-knives;and Fig. 7, a detached and enlarged side elevation of the double adjustin g-- gage:

A isithe bedor frame of the machine. B is the'dri'ving-shaft,on whichare placed two pulleys, 0,0, one fast and one loose. D is a standattached to the bed ,A'. l) and D are the boxes aifixed to the bed ofthe machine, in which the shaft B is held and revolves. E is a circularrevolving cutter-head, which is screwed on the end of the shaft B, andis constructed as hereinafter described. F is a double adjustable gagefastened to the screw G, which passes through a socket in the stand D,turned by a handwheel, H, and the gage is moved forward and back bv'thisscrew G,

operated by the ,hand-wheel H. It is held in position by aguiding-piece, which operates in the female-guides L L, attached to thebed A. This adjustable gage F is for the purpose of governing and gagingthe width of the. sole -to be trimmed, and is made double in order thatthe operator may trim the sole above or below the -cutter-head as. maybest suit his convenience. I I are adjustable guides attached to thefixed rests J 'J on the bed A.

These guides are also double, a set being.

placed on each side of the cutter-head, and" affixed, respectively, tothe top and bottom of therests J J. The surfaces of these guides,

Wh'en'in use, are a little retired from the cut-' ting-sgrfaces of theknives of the cutter-head, andthefv'are' raised and lowered by means ofthe right-and-left-handed thumb-screws K and K, each screw controllingan upper and lower guide at the same time, thus governing the thicknessof the material to betrimmed from the sole. a

The revolving circular cutter-head E (see Figs. 4, 5, and 6) isconstructed hollow, for the purpose of allowing the chips and shavingsof leather cut .from the sole to pass to its irate-- rior, and thenceout through the opening (1 in its face. The series of spiral knives a a,a a a are constructed parallel to its axis, and form a portion of itscircumference. They are made spiral for the purpose of producing draw--ing cuts. The outer'end of the'cutter-headis provided with a circulardisk or shield, for the purpose of protecting-the upperfrom injury onits inner face, and, forming a part of it, are a series of sinallvertical cutters, b b b b I), set at agiven angle (at nearly rightangles) to the spiral cutters, above and inclinedto their rear. Theperiphery of the face or shield of the cutter-head reaches above thecutting-knives, and'is turned perfectlysmooth on the outer edge, as seenat c in Figs. 4 and means of revolving cutters is old, but by the use ofmy improved. hollow cutter-head and double gages and rests I obtainimportant advantages over all other forms of construc- 7 tion.

I claim asnew and as my invention- 1'. 'Thehollow circular cutter-headE, having the spiral cutters a, a a a and a, ar-

ranged parallel to its axis; also, provided with a-circulardisk orshield at its outer end, the

periphery of which extends beyond the spiral cutters, and having uponits inner face the vertical cutters b, b, b, b and I), all cons'tructedfrom one solid piece of metal, arranged and operating substantially asand for the purposes herein shown and described.

2. In combination with the hollow circular cutter-head E, provided withthe two sets of. cutters and shield, the double adjusting-gage F,operating substantially as and for the pur I poses described and setforth.

' 3. In combination with the hollow circular cutter-head E, providedwith the two sets of cutters and shield, the double set of guides ILadjustable'by'means of thnmb -serewsli, substantially as and for thepurposes as described.

ROBERT F. BURNS. Witnesses:

A. L. MUNsoN,

W. H. GRAY.

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